地球深部金属碳化物的晶体化学

金属碳化物的矿物十分稀少,但人工合成物则在化学成分及晶体结构两方面分布均较为丰富,可分成两种结构类型,即填隙结构型及复杂化合物型,其形成机理与碳原子与金属原子的半径比(Rc/Rm)有关。金属碳化物是西藏罗布莎铬铁矿床地幔矿物群的重要组成部分。列举了在该地区已发现的若干金属碳化物种属。探讨了该类矿物的形成机理以及该类矿物中的某些种属表征其形成的温度、压力状态的可能性。

Crystal chemistry of metallic carbide minerals in the depths of Earth

Natural metallic carbide minerals are rare. But they are abundant in synthetic phases with varied chemical composition and crystal structures. Metallic carbides can be divided into two crystal structural types: 1the interstitial phase and 2the complex compound phase. Their formation mechanism is related to the ratio of carbonic atomic radius to metallic atomic radius (R_c/R_m). Metallic carbides are important components in the Luobusha chromite deposit in Tibet. In this paper we list a number of species of metallic carbide discovered in this area. The forming mechanism of this mineral species and the possibility of its being an indicator of temperature and pressure during the formation of some minerals are discussed.